46 Follow us on @PrairieFarming Better Farming | September 2024 E2 (corresponds with Rlm 7). Multiple blackleg races can often be identified within a field. In cases like these, find common avirulence genes listed within the phenotypes and determine the resistance group to look for from there. Using blackleg race testing results Once you have received your results and determined the corresponding resistance group, you can begin to make decisions regarding cultivar choices. For control in highrisk fields with tight rotations and a history of blackleg, producers may consider using qualitative resistance as it causes a reaction that can immediately stop infection. This is especially the case if blackleg failures have been seen in the past. You can find a list of canola cultivars and specific traits they have (including the blackleg resistance group) at canolacouncil.org by searching “canola cultivar traits.” Currently about half of the cultivars on the market have major R gene blackleg resistance labelling. Keep in mind there are many factors that go into choosing a cultivar, not just blackleg resistance. As a grower, consider what your largest sources of yield loss are and work from there to determine a cultivar. If you have seen major yield losses due to blackleg, then choosing based on blackleg resistance may be valuable. Blackleg has always and will always remain a factor when it comes to growing canola. Although resistant cultivars are valuable in management crop rotation, seed treatments and foliar fungicide applications all can play an important part as well. Never rely on a single tool when it comes to pest management, including blackleg. Check out blackleg.ca for more examples and further explanation on the intricacies of interpreting blackleg race tests. BF LEGENDARY SINCE 1971 ROZOL RTU Build your legacy with the legendary Rozol® RTU. Brought to you by Liphatech Ag, your Most Valuable Partner for effective rodent control. Commercial Product Only: Only to be used by certified pest control operators, farmers and persons authorized in government pest control programs. WE HAVE YOUR BACKS, BARNS AND BOTTOM LINES. 866.572.8240 Ag Insights ALLIE NOBLE Allie Noble is a crops extension specialist with the Saskatchewan Ministry of Agriculture in Prince Albert. Chart provided by Canola Council of Canada The resistance group labels identify the resistance group (RG) based on the major genes in a canola cultivar. It appears after the field resistance label in the two-page label. While 15 major gene resistance groups have been identified, only 10 are relevant to Canadian canola producers (see table below). A major gene resistance group label Rlm1 or LepR3 Major Gene Resistance Groups A B C D F G X E1 E2 RlmS or LepR2 Rlm2 LepR1 Rlm7 Rlm3 Rlm4 Rlm9 unknown
RkJQdWJsaXNoZXIy NTc0MDI3